The northwest one-quarter of the Prineville Quadrangle is
underlain by Tertiary and Quaternary volcanic and volcaniclastic
rocks of the Columbia River Basalt Group, and the Clarno, John Day,
Rattlesnake and Deschutes ...

The middle to upper Eocene Tillamook Volcanics form the volcanic core or basement rocks in the Rock Creek-Green Mountain area. They consist of a thick sequence of high TiO2 tholeiitic basalt, basaltic andesite, and andes ...

Eight Tertiary geologic units crop out in the Seaside-Young's River Falls area, including late Oligocene to early Miocene Oswald West mudstones; Angora Peak sandstone and Silver Point members of the middle Miocene Astori ...

The thesis area consists of 33 square miles in the south-central
Pueblo Mountains of Humboldt County, Nevada and Harney County,
Oregon. The Pueblo Mountains are tilted fault block mountains found
in the extreme northw ...

The Gandghar Range and Kherimar Hills, located in the Hill Ranges of northern
Pakistan, contain rocks that are transitional between unmetarnorphosed foreland-basin
strata to the south and high-grade metamorphic and plu ...

Five distinct lithologic units compose the Tertiary rocks in the Tillamook Head - Necanicum Junction area of the northern Oregon Coast Range. They are: the late Eocene to early Miocene Oswald West mudstones, the middle M ...